Ejecting implement for cold-pressed headed bolts



Jan. 14, 1930.

K. NAGEL EJ'EC'I'ING IMPLEMENT FOR COLD PRESSED BEADED BOLTS Filed March 8, 192a wxmm p 4 7 not be allowed to exceed a Patented Jan. 14, 1930 UNITED STATES PATENT OFFICE KONRAD RAGE, OI NUREMBERG, GERMANY, ASSIGNOR TO THE FIRM J. G. KAISER 4 A. G., 0]? NUBEMBERG, GERMANY IJ'ECTING IMPLEMENT FOR .COLD-PRESSED BEADED BOLTS Application alcd'larch 8, 1928, Serial No.

In the upse of heads on bolt. shanks that have been col -pressed in'a closed matrix mounted upon an ejecting needle, the shank parts have beenfound' by experience to bev.mencement of the ejectlon over a length which is at least equal to that of the bolt shank. On this part the needle is subjected to a buckling stress. It has been'found by experience that this unsupported length must ut eight times the diameter of the shank because otherwise the needle buckles and breaks. Consequently with a closedmatrix only headed bolts having shanks the length of which does not exceed eight times their diameter can be made.

Headed bolts having a greater ratio of length to diameter must therefore be upset col in a divided matrix. The shank becomes just as firmly wedged into the latter, but it nevertheless admits of being expelled by pushing the work-wire'from behind, because one j aw of the matrix then yields under spring pressure transversely to the ejecting direction. The length of shank is here practically unlimited, but this method gives rise to a considerable and unavoidable disadvantage, in the form of radial burs or fins on the mner annular surface of the head, and the adjacent end of the bolt, originating from the matrix gap.. These burs prevent a com lete and satisfactory bearing of the head, an for most purposes they have to be removed by a special 0 eration, carried out on special lathes. uch burs are not occasioned by the closed matrix, but with shanks the length of which exceeds eight times their diameter, the

closed matrix cannot be used, for the reasons hereinbefore set forth.

The object of the present invention is to provide an ejecting implement that enables eaded bolts which have been upset cold in a closed matrix and in which the length of the shank exceeds eight times its diameter, to be ejected without risk of breaking the ejecting needle. For this purpose the invention consists essentially 1n arranging behind the 260,220, a m in Germany March is, 1927.

closed matrix an undisplaceable sleeve which guides the ejecting guides an intermedlate piece which drives the ejecting needle before it, the guiding bore of the said sleeve being in connection w1th addi-' ,tional guiding ducts arranged in parallel with the said duct for the needle'and adapted to form lateral supports for the intermediate piece, and the cross-sectional area of which conforms to the total cross sectional shape of the said guiding ducts and so great that the part of it which stands out rearwards at the beginning of the ejection without lateral support to an extent at least equal to the length of the shank cannot buckle under the pressure exerted by the push rod for the purpose of overcoming the amming of the bolt shank.

The new ejecting implement is illustrated by way of example in the accompanying drawings, wherein gig. I is a rear view of the guiding sleeve, an

Fig. 2 a rear view of the intermediate piece to be guided therein.

Fig. 3 is a plan of the intermediate piece, gig. 4 shows the ejecting needle 1n plan, an

Fig. 5 the same in rear elevation.

Fig. 6 is a cross section through the intermediate piece and the sleeve guiding the same, and

Fig. 7 is a cross section through the ejecting needle and the sleeve.

Fig. 8 shows in longitudinal section the assembled ejecting implement fitted into the machine at the commencement of the ejecting operation, and

Fig. 9 shows the position of the arts of the implement at the termination of t e ejecting operation.

ig. 10 shows a different cross-sectional fpglm of. the sleeve and of the intermediate r a is the closed press matrix, 6 the matrix cover, c the anvil, f the machine body, and o the push rod guided therein. Up to this point the upsetting apparatus is substantially known. From known upsetting appliances, with closed matrices the present apparatus is distinguished merely by the exceptionally loe needle and which also givetherequisite resistance to not buckle under the great length of the matrix in comparison with the thickness of the bolt. The bore thereof, not shown, takes av shank s, the length l of which is more than eight times as great as its nally by a collar or shoulder 1'. The sleeve collar r is located in a recess at the back of the matrix and bears against the anvil c, which surrounds the cylindrical sleeve member g. For the guiding of the ejecting needle n the sleeve has a central longitudinal bore t. I The latter is connected by two slots 'v with,

two lateral longitudinal bores u.. In the slots '0, lateral lugs 02 on the needle head are guided. These lugs prevent the needle from rotating. The intermediate piece, which has to drive the needle before it, has a cross section which fits accurately into the three ducts t, u, u and into the slots 1) that connect them with one another. With a central longitudinal bulb or swelling t are connected by means of connecting bridge pieces 41' two lateral lon gitudinal bulbs or swellings u. The diameter of the longitudinal ducts u, and therefore of the marginal bulbs u of the intermediate piece, can be made considerably greater than the diameter of the central duct t and of the central bulb t, which is determined by the thickness of the shank 8 and of the needle n. The total crosssectional area of the intermediate rail can therefore be made, for any desired length of the shank s, so great that the part of it which projects rearwards without lateral support to a. distance at least equalto the length l of the bolt shank at the commencement ofthe ejecting operation canpressure of the push rod 0, which has to overcome the jamming of the shank s.

The shape of the cross section of the intermediate rail and of the guiding passage thereof may differ at will from those of the constructional example illustrated, rovided the huckling.

Thus according to Fig. 10 the mar al bulbs u embedded in the sleeve are rep aced by longitudinal flanges u", which are attached to longer transverse bridge pieces '0" and guided on parallel side surfaces of the sleeve 9. The needle 1:. would un er these circumstances have to be made longer by such an amount that the intermediaterailneed not penetrate into the collar r, for the latter should not be similarly slotted. Altogether the intermediate rail 1s of such a length L that even when very long headed bolts are being upset it finds a sufliciently long guide 111 the sleeve g. Hence merely by pressing,

ed to eject headed bolts with a press mark free from burs on the inner side i of the head, can be manufactured with shanks of which the length Z exceeds eight times the diameter d of the that have been cold pressed in a one-part matrix, comprising an ejecting needle, adapted to eject the bolt from the matrix after its shank has become jammed therein by the forming of its head, an intermediate piece adapted to drive said ejecting needle before it, a sleeve rigidly secured behind the closed matrix and adapted to guide said ejecting needle and said intermediate piece, and a push rod adapted to exert longitudinal pressure upon said intermediate piece and thereby upon the ejecting needle to eject the bolt from I the matrix the longitudinal bore of said sleeve being connected with additional bor'es adapted to form lateral supports for said intermediate piece.

2. An ejecting implement for headed bolts that have been cold pressed in a one-part matrix. comprising an ejecting needle, adaptthe bolt from the matrix after itsshank has become jammed therein by the forming of its head, an intermediate piece adapted to drive said ejecting needle before it, a sleeve arranged behind the closed matrix, and adapted to guide saidejecting needle and said intermediate piece, an abutment on said sleeve embedded in a recess of the said matrix adapted to prevent said sleevev from being moved longitudinally, and apush rod adapted to exert longitudinal pressure upon said in termediate piece and thereby upon the ejecting needle to eject the bolt from the matrix sleeve being. connected with additional guiding ducts adapted to form for said intermediate piece.

3. An ejecting implement for headed bolts that have been cold pressed in a one-part matrix, comprising an ejecting needle, adapted to eject the bolt from the matrix after its shank has become jammed therein by the forming of its head, an intermediate piece adapted to drive said ejecting needle before it, said intermediate piece having a cross section comprising a bulb-like central portion and enlarged outer portions connected with said central portion by bridge pieces, a sleeve rigidly secured behind the closed matrix, said sleeve being formed with an axial duct axial duct and connected with it by slots for lateral supports guiding said intermediate piece, and a push rod adapted to exert longitudinal pressure upon said intermediate piece and thereby upon the ejecting needle to eject the bolt from the matrix.

4.' An ejecting implement for headed bolts that have been cold pressed in a one-part tending radially out to the periphery of the matrix, comprising an ejecting needle, adapted to eject the bolt from the matrix after its shank has become jammed therein by the forming of itshead, an intermediate piece adapted to drive said ejecting needle before it, said intermediate piece having a cross section comprising a bulb-like central portion and enlarged outer portions connected with said central portion by bridge pieces, a sleeve arranged behind the closed matrix, said sleeve being formed with .an axial duct adapted to guide said ejecting needle and with further guiding ducts parallel to said axial duct and connected with it by slots for guiding said intermediate piece, an abutment on said sleeve adapted to prevent it from being moved longitudinally,

said intermediate piece and thereby upon the ejecting needle to eject the bolt from the matrix.

5. An ejecting implement for headed bolts that have been cold pressed in a one-part matrix, comprisin an ejecting needle, adapted to eject the olt from the matrix after its shank has become jammed therein by the forming of its head, an intermediate piece adapted to drive said ejecting needle'before it, said intermediate piece having a cross section comprising a bulb-like central portion and enlarged outer ortions connected with said central portion y bridge pieces, a sleeve arranged behind the closed matrix, an abutment on said sleeve adapted to prevent it from being moved longitudinally, the sleeve being formed with an axial duct adapted to guide the ejecting needle and with further guiding ducts parallel to said axial duct and connected with it by slots for guiding the intermediate piece, said further ducts exsleeve, and longitudinally right up to but not through the abutment on the sleeve,'and a push rod adapted to exert longitudinal pressure upon said intermediate piece and thereby upon the ejecting needle to eject the bolt from the matrix.

6. An ejecting im lement for headed bolts that have been col pressed in a one-part matrix, comprising an ejecting needle, adapted to eject the bolt from the matrix after its shank has become jammed therein by the forming of its head, an intermediate piece adapted to drive said ejecting needle before it, said intermediate iece having a cross section comprising a ulb-like central porand a push rod' adapted to exert longitudinal pressure upon vent it from being moved longitudinally, the

sleeve bein formed with an axial duct ada ted to gui e the ejecting needle and with further guiding ducts parallel to said axial duct and connected with it by slots for guiding the enlarged outer portions of the intermediate piece, said further ducts being formed by flattenings produced on opposite sides of the sleeve,-and longitudinally right up to but not through the abutment on the sleeve, and a push rod adapted to exert longitudinal pressure upon said intermediate piece and thereby upon the ejecting needle to eject the bolt from the matrix.

In testimony whereof I have signed my name to this specification.

KONRAD NAGEL.

tion and enlarged outer portions connected with said central portion by bridge pieces, 

